var xmlHttp1

function changeZone(str)
{
if (str.length==0)
  { 
  document.getElementById("zone").innerHTML="";
  return;
  }
xmlHttp1=GetXmlHttpObject();
if (xmlHttp1==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="changezone.php";
url=url+"?q="+str;
url=url+"&sid="+Math.random();
xmlHttp1.onreadystatechange=stateChanged1;
xmlHttp1.open("GET",url,true);
xmlHttp1.send(null);
} 


function stateChanged1() 
{ 
if (xmlHttp1.readyState==4)
{ 
document.getElementById("zone").innerHTML=xmlHttp1.responseText;
}
}

function GetXmlHttpObject()
{
var xmlHttp1=null;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp1=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp1=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    xmlHttp1=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
return xmlHttp1;
}